since i lowered my car a few weeks ago i have noticed a dull knocking noise when going over deep manhole covers ,i would say similar to a spring coming away from the mount for a split second
on not so severe pot holes i seem to get a rattle
definately to me its from the rear of the car , but sometimes on a nasty pot hole it also sounds like the front passenger side
the car was only lowered by 30 mm
ball joints have been checked all bolts that were removed when swapping the springs over have been checked
nothing visably loose , even had car on 2 poster ramp at brothers garage
and cant find the answer
never feel the knock on the drivers front though .
only suggestion he has is top mounts for rear shocks could be elongated in the hole
definately not windows rattling
any one else had this problem ?
dont mind spending on the car but dont fancy the wild goose chase first